Stop Check Valve

Name of Parts

Material

Advantages/Disadvantages

Valve Body

Bronze

Seawater corrosion resistance, a little more expensive than cast steel and cast iron

Cast Steel

The price is higher than cast iron and lower than bronze. Has high mechanical strength and toughness. It has special properties such as heat resistance, corrosion resistance and wear resistance.

Cast Iron

The price is lower than cast steel and bronze;

• corrosion-resistant

Valve Disc

Bronze

Bronze has excellent low temperature resistance, and the price is a little more expensive than stainless steel. The seawater resistance of bronze is better than that of stainless steel (304, 316), and stainless steel is afraid of CL pitting corrosion.

Stainless Steel

Stainless steel has a strong ability in tensile, wear and corrosion resistance. Stainless steel is much stronger than copper in material. Stainless steel will not produce corrosion, pitting, rust or wear and high temperature resistance.

Valve Stem

Stainless Steel 304

Acid resistance, alkali resistance, high temperature resistance, the price is lower than 316

Stainless Steel316

Both corrosion resistance and acid resistance are better than 304, and the price is a little higher than 304

Valve Bonnet

Bronze

Seawater corrosion resistance, a little more expensive than cast steel and cast iron

Cast Steel

The price is higher than cast iron and lower than bronze. Has high mechanical strength and toughness. It has special properties such as heat resistance, corrosion resistance and wear resistance.

Cast Iron

Not resistant to corrosion and cost less than bronze and cast steel

Hand Wheel

Cast Iron

Lower cost than bronze and cast steel

Comparison

Product Picture of other low quality supplier

Product Picture of our factory

Other low quality supplier

Consequence

Our Factory

Result

Jerry-build, the wall thickness of the valve body is not processed according to the standard

Uneven thickness, uneven material, easy to damage the valve body, short service life.

Strictly in accordance with the standard processing, uniform thickness, uniform material

Safe to use, to meet user needs, long service life of the product

Use iron, carbon steel to manufacture valves and repair scrap valves as shoddy valve products.

This kind of product generally has a big error in hardness and accuracy. Easy to cause shell cracking, running, running, dripping, leakage phenomenon, serious will cause oil, gas pipe explosion.

Strictly in accordance with customer material requirements to manufacture new valves, never shoddy.

Meet the hardness and precision requirements of standard valves,

The manufacturer considers the cost and purchases unqualified standard bolts

The hidden danger is left on the valve, resulting in an accident.

According to customer requirements, using standard bolt.

Ensure the valve quality, ensure the normal operation of equipment.

In order to reduce cost, bronze valve core is replaced with cast iron valve core,

Cast iron spool is prone to corrosion and damage

Material selection is strictly in accordance with user requirements

Use rest assured, reduce the safety hidden danger, reduce the accident rate.

Use ordinary round steel stem instead of stainless steel stem

The replacement material performance is unstable, ordinary round steel processing, the stem is thin and without any heat treatment, resulting in a decline in valve quality.

Made of stainless steel, the valve stem diameter meets the design requirements, and after high temperature quenching and tempering heat treatment.

High safety factor, reasonable structure

Product Pressure

5K, 10K, 16K, 20K

Standard

JIS

Medium

Air, gas, oil,etc.

Nominal Diameter

50-300

Brand name

Customer required

Material

Bronze,cast iron, cast steel

Application

Shipbuilding,ship repair

OEM service

Available

Certificate

ABS, BV, CCS, LR, RINA